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4145 Aluminum vs. SAE-AISI 1140 Steel

4145 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1140 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 4145 aluminum and the bottom bar is SAE-AISI 1140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 2.2
14 to 18
Fatigue Strength, MPa 48
230 to 370
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
72
Shear Strength, MPa 69
370 to 420
Tensile Strength: Ultimate (UTS), MPa 120
600 to 700
Tensile Strength: Yield (Proof), MPa 68
340 to 570

Thermal Properties

Latent Heat of Fusion, J/g 540
250
Maximum Temperature: Mechanical, °C 160
400
Melting Completion (Liquidus), °C 590
1460
Melting Onset (Solidus), °C 520
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 100
51
Thermal Expansion, µm/m-K 21
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 84
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.8
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
1.4
Embodied Energy, MJ/kg 140
18
Embodied Water, L/kg 1040
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
89 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 31
310 to 870
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
21 to 25
Strength to Weight: Bending, points 19
20 to 22
Thermal Diffusivity, mm2/s 42
14
Thermal Shock Resistance, points 5.5
18 to 21

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.37 to 0.44
Chromium (Cr), % 0 to 0.15
0
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
98.4 to 98.9
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.7 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
0
Sulfur (S), % 0
0.080 to 0.13
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0